Patent US3554833A successfully refreshed from Google Patents.
US3554833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of laminar thermoplastic films
Assignee: Mobil Oil AS
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Filing: 1968-01-12
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Granted: 1971-01-12
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Expires: 1988-01-12
Abstract
Abstract A METHOD FOR THE PRODUCTION OF THERMOPLASTIC FILM LAMINATES WHICH COMPRISES EXTRUDING A THERMOPLASTIC TUBE; INFLATING THE EXTRUDED TUBE WITH A GASEOUS MEDIUM; FLATTENING THE INFLATED TUBE BY PASSING IT THROUGH A PAIR OF ROTATING NIP ROLLERS, SAID COLLAPSING STEP BEING EFFECTED WHILE THE TUBULAR FILM IS STILL IN A HEAT-SOFTENED PLASTIC CONDITION WHEREBY THE WALLS OF THE TUBE FUSE TOGETHER THEREBY FORMING A FLAT, TWO-LAYER THERMOPLASTIC FILM LAMINATE.
Inventors
- 👤 William C De Vries
- 👤 Eldon L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:08
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/001; B29C48/0018; B29C48/0019; B29C48/09; B29C48/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |